Expansion-bolt.



A. C. BARRETT.

EXPANSION BOLT.

APPLICATION FILED JUN'B4, 1912 l Patented Mar. 24, 1914 i,oedeoo.

ARTHUR BARRE-Tu gpemcaeo, ILLINOIS.

EXPANSIN-BOLT.

. "application and .unies l1912. serialize. 701,573.

To ell @hom 'it may/ concernf v Be it known that I, ARTHUR C. BAIgRETT, a

citizen of the United- States of America, and 'a resident of Chicago,`in` the county of Cook, `-State of Illinois, have invented certainnew` and' useful Improvementsin Expansiontioni' This invention relates to that class of ex- -Bolts,' of which theI followingsis' a specifica- '.pansion bolts in-whicha split sleeve and nut 't are used' in connection withal'. machinev 4type offbolt to attain the functions sought,j `and the present improvement has forits-obtural formation' and combination'. of part-s :Whereby with an initial ,driving of the .sleeve 'and' nut into .place in' ,-a4 Wall .or like "socket partialexpansion of -the inner end of the.. vsleeve'. takes place to cause the same tu se "cureitself against, rotation, as the machine bolt is screwediint place to effectthe linal expansion of the sleeve and. 'the anchoring of -l the appliance in. fthe-Wall socket, and withwhich'the proper longitudinal..alinement of the'expander nut is maintained'and so. that the point of the machinebolt :used Will be effectively guided and its screw-'thread made to properly engage 'the screw-threaded-por` tion of said nut; all as willhereinaftermore fully' appear.

In the accompanying-drawings: Figure 1, is a longitudinal section showing my. 11n- 'proved' expansion boltinuse,l p Fig. '2, is a transverse section. of the'sleev, on line x-m, 1.\' Fig. 3, is a side elevation of. the sleeve. Fig.- 4, .is a transverse section of saine on linearer', Fig. 3. Fig. 5, is a rear end elevation ofthe same. Fig'. 6, yis a front elevation of the expander nut. F ig.l 7, is a 'cegotral llongitudinal section of the same. Fig-8, is a rear elevation of the same.

Similar reference numerals indicatelike parts in the several views.

gortion of a building Wall, partition` or the ke', and 2 a socket formed therein for the', I .ijeceptionof an expansion bolt. Such socket is Ordinarily drilled of substantially uniform diameter, throughout its r length but owing to careless handling of the drill, the outer end of the socketbecomes more or lss lflared asshown. -v fv 3 isa Vsleeve designed to be driven .into 'the socket. The sleeve .is split throughout itslength and the members are relatively spaced to provide'interven'ing tapering slots Referring to the drawings, 1 re resents a' tbetween their'adjoning edges. vAt 5 the members of the sleeve are locked together by lugs of one entering surface recesses ofthe other, as is clearly shown in Figs. 3 and 4. Extemorly, the sleeve is given the form'of a connected series of truncated cones, the outer one '6 being of a larger diameter and greater length than the others, telit snugly within lthe, flared outerend of the socket.' Thus ar-4 Speifietien @Letters Patent. v Patented Mar."24,1914.

`l'rangerLthey resist rotation or turning of the vsleeve in the socket and in 'takinginto the yvall thereof, vprevent withdrawal or work 111g of the'slee've outward. Interiorly` the sleeve is provided with asmoothbore, which near its rear end is formed into an enlarged cylindrical -counterbore 7, which in turn is formed with a Haring rear' end portiony 8, that merges from a circular into an elliptical form to .receive the specially formed einv the expander nutA 9,' 'also of. elliptical cross 'section at its rear end, ista ered to the angle vo'l'tl-l"1e' ,ila1ed portion 8 o the. bore of the 'sleeve 3, and merges fromsuchnelliptical form into a circular form at its mid-length.

l'tsfforward portion 10 is cylindrical and' adzqu'ted to have-longitudinal travel in the .enlarged cylindrical counterbore 7 of thesleeve, and he held thereby in 'proper'longitudinal alinement with the other parts of the 'appliance previous to lthe operation of expanding the sam'e into bindin engagement in the Wall socket 2, aforesai .In connection With such, special constrpction of the dxpandernut 9. In the present unprovement pander vnut 9,4 another material. feature of thepresent improvement comprises the formation Aof the'rear portion of 'the bore of .said nut with a threaded portionJQ, adaptedforA operative engagement with the threaded end of an ordinary machine bolt 13, used .inthe present a plance, and with-an unsaid threaded vportion A12 and, ofthe same. di# -axneter as the shank of the bolt 13 and .threaded cylindrical portion 1.1 forward of adapted to receivejthe end portion of said bolt tand' guide itinto 'proper engagement Withv the aforesaid screw-threaded portion L ,12 of the -loore-offthe4 nut', in the practical use'of the present appliance.

' Q14 are lugs or projections 'at diametrically opposite points on the periphery of the nut 9, and adapted to enter and have movement 'in the tapering slots @between the' sleeve members above desc "lbed In looking the remt together at the 'outer jend' only. of th sleeve, t e inner ends 'thereof are left Iree'and are separated or l.forced apart by theaction of the tapered Anut 9 on entering v"and being drawn into the bore of the sleeve,`as will be hereinafter more fully described...` Preferably the nut is relatively proportioned to partly enter th flared end of the sleeve bore without separating t-he members and is heldthus normally by the projections 14 thereof'in vthe slots 4, which latter are closed at the inner end of the sleeve by meeting lugs 15 of the members, and a materia-l feature of the present. improvement involves a straight transverse bearing ksurface between said projections 14 and meeting'lugs 15, as shown in Fig. 3..

In order that, in the preliminary opera` tion of forcing the sleeve into place in the wall socket, the machine bolt 13 may be made to engage the nut 9,*a'nd in that said nut through the described connection has driving engagement with the sleeve 3, so that as the operator hammers upon the head of the bolt 13, the' parts will be readily forced into placcin the wall socket, ready 'for the final expandingoperation. 'Assuming the sleeve to be in positionin the socket, the bolt 15 is passed .through an opening lin the bracket 16 or other article to be secured tothe wall, and then on through the bore of the sleeve to engage the thread of the nut 9. On rotating the bolt, the nut is drawn farther into the flared end of the bore of the sleeve, expanding the saine by forcing the members 'thereof apart and causing the ratchet-tooth formation exteriorly of each member, to engage and become embedded in the wall of the socket, firmly locking the several parts of the device together in the socket and forming a secure and safe fastening capable of supporting great weight.

Having thus fully described my said invention what I claim as new anddesire to secure by Letters Patent, is

1. in expansion bolt sleeve, having a bore the rear portion of which is formed with an expanded cylinder portion and with a fiaring rearend portion in connected relation, a

` cooperating tapered nut having a cylindrical extension at its forward end, and a bolt extending through .the bore of the sleeve and threaded into the nut.

2. An expansion bolt sleeve having a bore the rear ortion of which is formed Withan expanded) cylindrical portion and with a flaring rear end portion circular at its-'point of juncture with lsaid expanded portion and merging therefrom into an elliptical form at its rear end, a coperating tapered nut of an elliptical form at its rear end and having a cylindrical extension at its forward end,

and a bolt extending throughthe bore of the sleeveand threaded into the nut.

3. An/ expansion bolt sleeve having a bore the rear portion of which is formed with an expanded cylindrical portion and with a flaring rear end portion circular at its point of juncture with said expanded portion andl merging therefrom into an'elliptical form at its rear end, a cooperating tapered nut of an 10 elliptical form at its rear end and having'a cylindrical extension at its forward end, the bore of said nut having an unthreaded forf ward p'ortion'and a threaded -rear portion, and a bolt extending through the bore of the sleeve and threaded into the nut. l

4. Avs'ect-ional expansion bolt sleeve, thefy sections of which are locked together at ono Y end only and vrelatively spaced to provide intervening tapering slots the rear ends of which are closedv by meeting lugs', a nut having .projections disposedin ,said slots and having straight ltransverse rear bearing faces, the rear ends of said `projections having straight transverse bearing surfaces adapted to afford a straight transverse bearing against the lugs aforesaid 4inthe initial operation of introducing the sleeve into place, and a bolt adapted to draw the nutinto the-bore of the sleeve.

Signed at Chicago, Illinois, .this 3rd dayl of June 1912.

' ARTHUR- C. BARR-ETT..

lVitnesses Bonnin? BURNS, HENRY Mon. 

